Roots of OH MY GIRL

B1A4 (Korean: 비원에이포) is a South Korean boy band formed by WM Entertainment. The group debuted on April 23, 2011, with the single "O.K" from the EP Let's Fly, after being introduced to the public through a webtoon. They have released nine studio albums and seven EPs, as well as four compilation albums. The group had considerable commercial and critical success in both the Korean and Japanese markets. They have also toured in the United States.

Lovelyz (Korean: 러블리즈) is a South Korean girl group formed in 2014 by Woollim Entertainment and is the company's first girl group. The group consists of eight members: Baby Soul, Jiae, Jisoo, Mijoo, Kei, Jin, Sujeong, and Yein. Their debut album, Girls' Invasion, was released on November 17, 2014.